Left-Side PRECISION Powermeter - Ride Ready ReCYCLED

Côté Opposé à l'Entraînement Precision Capteur de Puissance

Ride Ready reCYCLED
$219.99 USD $284.99 USD En vente

Used to pace attacks up the Alpe D’Huez in the Tour de France and to hammer on the Queen K during the Ironman World Championships, the PRECISION Powermeter delivers accuracy and reliability when you need it most. Through our patented 3D Strain Gauge technology, you can be assured that the data you depend on will lead you to your own Yellow Jersey. Packaged into a durable lightweight design and compatible with ANT+ and Bluetooth Smart headunits, PRECISION will help you train harder and smarter.


How Does It Work?

A ride ready PRECISION pod is already preinstalled on a previously-ridden Shimano crank arm at our factory. The moment you order, our fulfillment team will get it on its way to you, and you should be able to ride with power as soon as it arrives.

Important: You need to use the frame clearance guides to ensure there is space between your crank and frame for the PRECISION pods.

In The Box

Once your ride-ready reCYCLED PRECISION Powermeter arrives, it just needs to be installed on your bike using the standard Shimano crank installation process. Connect a headunit or computer, and you can start riding with power!


  • Light Weight

    At only 9 grams the Precision 3 Powermeter weighs about the same as a sip from your water bottle. Our goal is to help you get faster, not to slow you down.

  • Battery Life

    With over 100 hours of battery life, you won’t have to worry about frequent changes.

  • Accuracy in 3D

    Not everyone has the perfect pedal stroke. With +/- 1% accuracy, 4iiii is the only crank-based power meter to use 3 strain gauges to measure all forces in your pedal stroke.

  • 3 Year Warranty

    A lot can happen in 3 years. You probably won’t need to use it, but it’s reassuring to know that all 4iiii power meters are backed by an industry leading 3-year warranty.


Specification Value
Module Weight 9g (0.6oz)
Power Range 0 - 4,000W
Cadence Range 30 - 150RPM
Communication Protocols ANT+, Bluetooth
Operating Temperature 0 - 50°C (32 - 122°F)
Storage Temperature -20 - 50°C (4 - 122°F)
Battery Type CR2032 lithium ion coin cell
Battery Life 100+ hrs
Waterproof Rating IPx7, IPx5
Length 37.7mm (1.5in)
Width 27.6mm (1.1in)
Depth 7.5mm (0.3in)


A 4iiii PRECISION power meter is available ready to ride on any of the crankset configurations listed below. If your desired crankset isn't listed, we may have other products that are compatible.

  • Shimano 105 FC-5800
  • Shimano 105 FC-R7000
  • Shimano Ultegra FC-6800
  • Shimano Ultegra FC-R8000
  • Shimano Dura-Ace FC-9000
  • Shimano Dura-Ace FC-R9100
  • Shimano GRX FC-RX810
  • Shimano XT FC-M8000
  • Shimano XTR FC-M9000
  • Shimano XTR FC-M9020
  • Shimano XTR FC-M9100

À L'intérieur

If the weather or climate make riding outdoors tough, your 4iiii power meter can be used with all popular indoor-training apps, such as Zwift, TrainerRoad, Wahoo SYSTM, Rouvy, and more. Simply use your favourite app’s connection procedure over ANT+ or Bluetooth Smart, put your bike on a trainer, and get riding!

  1. Indoor Training


  1. Guide de Démarrage Rapide
  2. Clearance Guide (Letter)
  3. Clearance Guide (A4)
  4. iOS App
  5. Android App

Customer Reviews

Based on 54 reviews
The Right Choice

Was NOT in the market for a new bike, but couldn't pass on the one I bought, but realized that I had grown used to using the PM on my old bike, and would need one for the new ride. Did a LOT of shopping and came down to 4iiii and their main competition. When I found the clearance section on 4iiii's website, I knew I was in the right place. Have only ridden with the new PM for a couple weeks. Install was insanely simple, as was connection to my Garmin. Pain free and even though it was previously ridden, there were only a couple of scratches on it, less than what I'll likely ding it up after riding a year. Best option in my opinion since it was lower cost and comes with the 4iiii warranty. Once I get the new bike paid off, I may consider buying another for my gravel bike so that I've got power data for both rides.


Great Power Meter compared to the other companies I used in the past

Works as advertised

Have now trained with Stages, Powerops pedals, Garmin Vector all of which work well to various degrees. So far 4iiii single sided have not disappointed and I now prefer the crank ahead of power pedal measuring option as it gives me the option of a better pedal with lower stack which I prefer. Delivery to SA (only necessary as local agent does not stock my crank length) was incredibly quick.

Eric Chilson
Previously Ridden??

After starting an indoor training plan on a smart trainer, it quickly became apparent that riding with a power meter was going to be necessary. I was told not to spend $1000 to find out that I was pushing 180w up my local climb. The left side Precision was the perfect fit but I have the older R6800 Shimano Ultegra and to my surprise, 4iiii had a previously ridden option at a price I couldn't ignore. I was expecting to see a crank arm that looked like it had been ridden and the condition was way beyond expectation! Easy installation, even easier to pair with my Wahoo Roam and now I am ruined!! My entire strategy of my riding is based upon my power numbers now. I think on my next bike that I will opt for the both sided option because I would like to see the variation of sides but if you're on the fence about using a power meter, treat yourself to left side unit and don't look back!! Exceeded my expectations on everything!

Samuel Schweizer
Great Experience, Pedals Didn't Fit

I had a great experience purchasing, receiving, and installing this crank arm. However, once the crank arm was installed, it was apparent that the power meter housing rubbed on my left chain stay. I'm returning the crank arm. I would definitely recommend checking carefully that your frame fits with these products prior to purchasing.

Hi Samuel,
Thank you for your order, and we are sorry to hear the powermeter didn't fit your bike. We will for sure work with you to have your crank returned. To get a powermeter on your bike, we can also you a Factory Installed powermeter. A Factory Installed powermeter is installed on your crank arm at our factory, and we can customize the location of the powermeter on the crank arm to ensure that it fits your bike. You can find more information at the link below:


If you have any other questions, please reach out to our support team at 4iiii.com/support.
The 4iiii Team